Can you have too much GABA?

I always feel like my brain is suppressed. It is like I am in a fog and just can not snap out of it. The below passage has me wondering if it is possible to have too much GABA? I have been supplmeneting 3 grams per night for years and it has had a calming effect.

As a side note....my HGH is above range and GABA supposedly encourages this.

"In other words, alcohol consumption creates a demand for more GABA. GABA is a neurotransmitter responsible for restricting, or depressing the excitability of our brain. Glutamate is the Neurotransmitter that has the opposite effect as it is responsible for brain excitability and can be increased through the intake of various stimulants. It now gets a bit complex."